Time Battle

A young army vet, Shay Case, is now working for the  Federal Emission Control Commission. Watchdog of poisonous gas emissions in coal mines. She has been called to investigate one such mine near Charleston WV. The emission is quick working and renders the young girl unconscious. When she wakens, she finds herself five centuries into the future. The world she finds is a Steampunk lover's dream. The current civilization is tribal, and in some ways,  mirrors a lot of ancient Greek mythology.
The society is run by females, a nod to the Amazons of legend. But surprisingly, the inhabitants enjoy most of the twenty-first-century conveniences including air travel, which is used in warfare in this future time. All this is due to the clever use of steam power, and gears. Shay accidentally comes across a young person caught in an air raid and rushes to their rescue. Afterward, Shay learns the young person is a princess,  Princess Diire and her mother is the queen, Queen Weena,  of one of the villages in the region.
Shay is invited back to the village to meet the tribal leaders and relate her story of life in the twenty-first century. Her stay in the village exposes Shay to several cultural eccentricities, which Shay accepts without question.